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Divergent trajectories in arithmetic homogeneous spaces of rational rank two

Part of: Lie groups Diophantine approximation, transcendental number theory

Published online by Cambridge University Press:  05 November 2020

NATTALIE TAMAM
NATTALIE TAMAM*
Affiliation:
Department of Mathematics, Tel Aviv University, Tel Aviv, Israel (e-mail: natalita@post.tau.ac.il)
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Abstract

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Let G be a semisimple real algebraic group defined over ${\mathbb {Q}}$ , $\Gamma $ be an arithmetic subgroup of G, and T be a maximal ${\mathbb {R}}$ -split torus. A trajectory in $G/\Gamma $ is divergent if eventually it leaves every compact subset. In some cases there is a finite collection of explicit algebraic data which accounts for the divergence. If this is the case, the divergent trajectory is called obvious. Given a closed cone in T, we study the existence of non-obvious divergent trajectories under its action in $G\kern-1pt{/}\kern-1pt\Gamma $ . We get a sufficient condition for the existence of a non-obvious divergence trajectory in the general case, and a full classification under the assumption that $\mathrm {rank}_{{\mathbb {Q}}}G=\mathrm {rank}_{{\mathbb {R}}}G=2$ .

Keywords

group actionshomogeneous dynamicsarithmetic groupsLie groups representation

MSC classification

Primary: 22E40: Discrete subgroups of Lie groups
Secondary: 11J13: Simultaneous homogeneous approximation, linear forms
Type
Original Article
Information
Ergodic Theory and Dynamical Systems , Volume 41 , Issue 10 , October 2021 , pp. 3116 - 3141
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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